Adjustable Polarization Converter Using Liquid Crystal Layer
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Solution Overview
Problem
Conventional electromagnetic wave polarization converters are not adjustable and have fixed polarization torsional characteristics, limiting their application in multi-purpose wireless communication systems, and existing space feed adjustable polarization converters operate at relatively low frequencies due to parasitic parameters of varactor or switching diodes.
Innovation Solution
An adjustable polarization converter is designed with a first and second substrate and a liquid crystal layer in between, featuring a conductive frame and triangular conductive patches, forming a composite resonant structure that allows for polarization conversion of incident electromagnetic waves at higher frequencies using a thin liquid crystal layer with strong anisotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polarization converters are used, then the structure is simple, but the operating frequency is limited to low frequencies due to parasitic parameters of varactor or switching diodes
Solution Approach 1:
The patent changes the fundamental operating parameters by replacing diode-based tuning with liquid crystal-based tuning. The liquid crystal layer's dielectric properties can be adjusted by applying voltage, enabling polarization conversion at higher frequencies without the parasitic parameter limitations of varactor or switching diodes. This allows the system to operate in higher frequency ranges while maintaining structural simplicity.
Solution Approach 2:
The patent substitutes the mechanical/electrical diode-based tuning mechanism with a liquid crystal-based optical/electromagnetic mechanism. The liquid crystal molecules reorient in response to electric fields, changing the polarization state of electromagnetic waves at higher frequencies without the parasitic capacitance and inductance issues that limit diode-based systems.
2Productivity
If a thin liquid crystal layer with strong anisotropy is used, then the response speed is fast and processing precision is high, but the device complexity increases
Solution Approach 1:
The patent employs a composite structure combining substrates, liquid crystal layer, and electrode patterns. The liquid crystal material itself exhibits strong anisotropy, which enhances the polarization conversion effect. This composite approach achieves fast response and high precision while distributing the complexity across multiple functional layers rather than concentrating it in a single complex component.
Solution Approach 2:
The patent divides the device into distinct functional layers: substrates for structural support, liquid crystal layer for polarization control, and electrode patterns for actuation. This segmentation allows each layer to be optimized independently and simplifies manufacturing processes, reducing overall device complexity despite the advanced functionality.
3Adaptability or versatility
If adjustable polarization conversion is implemented, then the adaptability is improved, but the device complexity increases compared to fixed polarization converters
Solution Approach 1:
The patent implements dynamic polarization conversion by using a liquid crystal layer that can change its optical properties in real-time in response to applied voltage. The liquid crystal molecules reorient dynamically, allowing the polarization state to be adjusted on-the-fly without mechanical moving parts, thus achieving adaptability with relatively simple structure.
Solution Approach 2:
The liquid crystal layer acts as an intermediary between the electrode patterns and the electromagnetic waves. It translates electrical signals into optical/electromagnetic polarization changes, providing adjustable polarization conversion without requiring complex mechanical or electrical switching mechanisms. This intermediary approach simplifies the overall device structure while maintaining high adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables polarization conversion at higher frequencies, simplifies processing with high precision, achieves fast response speed, and expands the operating frequency range, addressing the limitations of conventional converters with low operating frequencies.
Implementation Method 1
a liquid crystal layer between the first substrate and the second substrate
Implementation Method 2
The electromagnetic wave polarization converter is an important component in the antenna feed system, which is of important for improving the channel capacity and improving the signal-to-noise ratio of the wireless communication system. A role of the polarization converter is to change the polarization state of the incident electromagnetic wave to another polarization state
Implementation Method 3
featuring a conductive frame and triangular conductive patches, forming a composite resonant structure that allows for polarization conversion of incident electromagnetic waves at higher frequencies
Data Source
AI summary
An adjustable polarization converter and an electronic device are provided. The adjustable polarization converter includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate. The first substrate includes a first base substrate and a first electrode on the first base substrate; the second substrate includes a second base substrate and a second electrode on the second base substrate. The first electrode includes a conductive frame and two triangular conductive patches. The conductive frame includes two openings disposed in sequence, and the two triangular conductive patches are disposed in a region surrounded by the conductive frame and are centrally symmetric.